here's some of those I found:

• /c/linux@lemmy.ml
• /c/programming@beehaw.org
• /c/programmerhumor@lemmy.ml
• /c/linux@kbin.social
• /c/programming@kbin.social
• /c/programming@programming.dev

there are some general "tech" ones too

• /c/technology@lemmy.ml
• /c/tech@lemmy.fmhy.ml
• /c/tech@kbin.social

and finally, some (digital) privacy-focused ones. That doesn't exactly fit the bill, but it's a safe bet if you're into linux and foss that you're also into privacy :)

• /c/privacy@lemmy.ml
• /c/privacyguides@lemmy.one (this is the official instance of the PrivacyGuides website)

happy exploring!